I puchased this for use with my 70D and it works great and uses the same battery.It adds some nice features such as focus peaking and zebras.When turned on the screen on the camera does turn off so any menu or shooting changes need to be made using the control buttons. It work great with glasses and includes a spacer to add more adjustability if needed. The unit is very light but is fairly large and I ended up getting a DSLR cage system to mount it.

I purchased this EVF after returning the Zacuto C100 Z-Finder Pro. For $ more I was able to get the EVF4C a true EVF with flip out viewfinder. I have been using the Cineroid evf for everything. it adds an extra level of stability to the camera and helps with critical focusing. The peaking is not much be be desired but works ok. For indoor use it can be used a second monitor. The eyecup is very comfortable and blocks out sunlight. It also keeps the camera in stealth mode when operation outdoors day and night. This is one of the best investment towards the C100 thus Far.

This sounded to good to be true, and it is. The peaking is terrible, causing all the display items on the screen to "peak" along with the focus, and really is unusable. It is also difficult to shut out the sunlight with the eyepiece. I would stay away.

I have to admit that I'm not familiar at all with any other electronic viewfinders to know where the EVF4C stands on the scale. However, in my personal experience it's what makes it possible for me to successfully shoot dSLR-based video. It works extremely well, and the "use red dots to show me sharpness" mode is the key to manual focus. I'm very happy with it on my Canon T3i and my Canon 7D.A couple of notes: there appear to be two different models out there. A coworker's that I trialed took a Sony battery and had mini-HDMI connectors; however, the model I bought & received, which I assume is the current one, uses a Canon LP-E6 (7D, 5Dmkii) battery and has a full-size HDMI connector. It does not include a mount. I bought and am very pleased with the WindTech CM-80 hot shoe-to-1/4" adapter.The only quirk I face is that the Canons switch modes (1080i when idle, 480i when recording) and that means a resync (color bar screen) whenever I start or stop recording.My coworker uses this professionally in the studio and has been pleased with it there.